Sprinkler head



E. J. HUNTER SPRINKLER HEAD Oct. 20, 1959 2 Sheets-Shea?l l Filed March26, 1957 INVENTOR. bn/mf d /f//vrf'e BY @wg CDA- QTTOEWEV E. J. HUNTERSPRINKLERVHEAD Oct. 20, 1959 2 Sheets-Sheet 2 Filed March 26, 1957 R O TN E V m y ZW/Af dbb/V756 BY @Q C@ MMM 77'06/1/57 United States PatentOffice y 2,909,325 l Patented Qct. 20, 1959 This invention relates tosprinkler heads, more particularly to lawn sprinklers of the pop-up typeand included in the objects of this invention, are:

First, to provide a sprinkler head wherein a small water turbine Wheelrotating at relatively high speed effects slow rotation of the sprinklernozzle means by a unique wobble tube and precession drive meansinvolving `a yminimum of moving parts, yet effecting a drastic -speedreduction between the turbine wheel and the sprinkler nozzle means.

Second, to provide 'a sprinkler head wherein a large number ofrelatively small jets are discharged radially :from the rotatingsprinkler nozzle means, some of which are interrupted or spoiled so thatthe spray pattern is substantially uniform.

Third, to provide a sprinkler head which incorporates a novel sprinklerjet control means that may be predetermined to cause sprinkling of afull circle or any selected arc of a circle, such as but not limited toa three-quarter, half, or quarter circle, and wherein, irrespective ofthe arc, whether a full circle or less, the coverage per unit area isconstant; for example, the quantity of water applied to a full circle isfour times the quantity applied to a quarter circle, thus insuringuniform coverage, although an installation may require fu-ll circle andvarious partial circle -sprinkler heads.

Fourth, to provide a sprinkler head which has a relatively largesprinkling radius, but which has a relatively low rate of application ofwater so that run-olf is minimized and the capacity of the supply systemis correspondingly reduced; that is, the control valves, pipe lines, andttings servicing a series of sprinkler heads may be of minimum size, andthe demand on the water supply is minimized so that installation costsand operating expenses of a sprinkler system utilizing the sprinklerhead is correspondingly reduced.

Fifth, to provide a sprinkler head of the pop-up type wherein thesprinkler nozzle means includes` a novel seal operative when thesprinkler head is shut olf, to prevent drainage of residual water fromthe lowermost sprinkler heads of a sprinkler system, to prevent dirtgetting into the sprinkler heads, and to prevent algae and lime growthwhich develop in the presence of water standing in a sprinkler head.

Sixth, to provide a sprinkler head of the pop-up type which isselfcleaning during the extension and retraction movements of thesprinkler nozzle means so that the sprinkler head is maintained inoperative condition.

Seventh, to provide a `sprinkler head which is so designed as to providea screen or iilter of substantial area to minimize clogging of thesprinkler head, and which is further so arranged that the sprinkler headmay be quickly serviced without aggravating the danger of dirt enteringthe sprinkler head.

With the above and other objects in view as may appear hereinafter,reference is directed to the accompanying drawings in which: l i

Figure 1 is a side View of the sprinkler head shown in its extendedposition.

Figure 2 is a a side View thereof, partially in eleva-Y tion andpartially in section, with the sprinkler head shown in its retractedposition, the sprinkler casing and cap being shown in section.

Figures 3, 4, 5, and 6 are transverse sectional views of the sprinklernozzle means, Figure 5 being taken through 5 5 of Figure 7 -showinggahalf-circle sprinkler, whereas Figures 3, 4, and 6 arecorrespondingtransverse sectional views showing respectively a full circle,three-quarter circle, and one-quarter circle sprinkler.

Figure 7 is an enlarged` longitudinal sectional View' through 7 7 ofFigure 1, showing the sprinklerhead in its extended position. k

Figure 8 is an enlarged transverse sectional view through 8-8 of Figure7, showing particularly the precession drive for the sprinkler nozzle.

Figure 9 is 'an enlarged fragmentary sectional View through 9--9 ofFigure 8. v

Figure l() is a transverse sectional view through 10-10 of Figure 7.

Figure 1l is ya transverse sectional View through 1111 of Figure 7.

The Vsprinkler head includes a cylindrical casing 1 `having a reducedlower end which is internally screwthreaded to form a water inlet 2arranged for connection to a water supply line.l The other or upper endof the casing is open and receives a `cap 3= having a marginal flangewhich iits over the casing. The casing and'cap are joined by ascrewthread connection 4.

Centered in the cap 3 and extending into the casing is a tubular slidebearing 5 A riser 6 is slidable within the c-asing and is arranged toprotrude from the capv 2.

The riser includes a tubular stein 7 axially slidable in the bearing 5.The llower extremity of the bearing is internally beveled and the stemis provided with a mating beveled stop shoulder 8, which seals againstthe end of the bearing when the riser is extended.

The lower end ofthe stem is enlarged to form a rotor housing 9 having anopen lower end. A return spring 10 is interposed between the Vupper sideof the rotor housing and the cap 3 to urge the stem 7 from its extendedposition shown in Figures 1 and 7 to its retracted position' shown vinFigure 2. The upper end of the housing is provided with an externalflange 11 guided within the walls of the casing. The flange 11 isnotched and the interior of the casing is provided with longitudinalribs 12 which prevent rotation of the riser 6.

The lower end of the rotor housing 9 is closed by a rotor base 13 whichforms with the interior of the housing a rotor chamber 14. A pin shaft15 extends concentrically Within the rotor housing and journa'lledthereon is a rotor 16 having radial blades. i

The surrounding walls of the rotor housing are provided with severalnozzle oriiices 17 directed tangentially toward the rotor. Waterjettingl tangentially inwardly through the orifices turn the rotor 16 atrelatively high speed. The rotor blades` are canted or slightly helicalin a direction to produce a Islight downward force component to maintainthe rotor seated on the base 13.

A cylindrical screen 18 surrounds the rotor housing 9 between the flange11 and rotor base 13. The walls of the rotor housing are relieved behindthe screen to provide ample access to the nozzle orifices 117.

Provided at the vupper axial end of the rotor V is an eccentric boss`,19 which iits into a socket 20 formed in the lower end of a wobble'tube 21 which extends upwardly into the tubular stem 7. Above thesocket 20 the wobble tube is closed by a partition. The remainder of thetube forms a flow duct 22 accessible through perforations 23 in the sidewalls of the" wobble tube. A cross pin Z4 extends loosely lthrough apair ofthe perfrations. The extremities of the cross pin 24 arerestrained by longitudinal grooves 25 formed within the tubular stem 7.The tube 21 is thus free to wobble or gyrate as the eccentric androtorturn, but the Vtube cannot turn.

The upper portion of the wobble tube is reduced slightlyv kIn order topreselect the arc of a circle to be sprinkled,

the upper end of the wobble tube isnotched to expose a preselected arcof port slits, leaving a valve lip which closes the other ports. l

Thus, if a quarter-circle sprinkler is desired, the lip, designated 28,occupies three quarters of a circle, as shown in Figure 6. If ahalf-circle sprinkler is desired, the lip, designated 29, occupies ahalf-circle as shown in Figures and 7. If a three-quarter circlesprinkler is desired, the lip, designated 30 occupies one quanter of acircle, as shown in Figure 4. If the lip is omitted, a full circle-sprinkler is provided as shown in Figure 3. By preselecting the arcuateextent of fthe valve lip, any complementary arc of a circle may besprinkled. Y

Fitted on the precession sleeve 26 below the ring of port slits 27 is anozzle ring 31 having avfrusto-conical upper surface. Fitted over thesleeve 26 and secured thereto by a screw 32 is a nozzle cap 33.A Theunder side of the nozzle cap is frusto-conical to mate the nozzle ring31, and is provided with radiating nozzle slots which form with thenozzle ring 31 radiating nozzle passages 34. The nozzle cap 33 is sosecured on the sleeve 26 that the passages 34 register with the portslits 27.

Above the passage 34, the nozzle cap is provided with an upwardlydirected and slightly flaring rim 35, the base end of which is equal tothe external diameter of the tubular stem 7. Depending from the rim 35in front of several of the nozzle passages 34 are rudimentary spoilertongues 36. In the construction illustrated twelve nozzle passages andfour spoiler tongues are provided. The spoiler tongues break upthecorresponding water jets and serve to produce uniform distribution ofwater.`

The upper end of the tubular stem 7 terminates below thevnozzle ring31-and is provided at its upper end with a 4 small internal shoulder 37.Fitted within the'upper end portion of the stern is a precession ring 38having an internal ilange 39 under the shoulder 37. A seal ring 40 isinterposed between the ring 38 and the sleeve 26.

The lower edge of the precession ring 38 is beveled inwardly to form anannular drive lip 41. The precession sleeve 26 is provided with anexternal flange I42, the upper peripheral portion of which forms a driveshoulder 43 which bears against the drive lip 41.

It will be observed that the wobble tube 21 and the precession sleevethereon tend to wobble or gyrate about an approximate point locatedwithin the internal flange 37 and seal ring `4t); that is, the commonaxis of the wobble `tube and precession sleeve generates an acuteconical iigure of revloution about the axis of the tubular stem 7. Theaxis common to the wobble tube and precession sleeve forms a small acuteangle with the axis ofthe tubular stem 7 and the precession ring 38fixed therein. The plane deined by the drive shoulder 43 occupies acorrespondingly small angular relation with the plane dened by Ithedrive lip 41. The shoulder and drive lip thus contact at one point whichprecesses around the drive shoulder and drive lip as the wobble tube isgyrated by the eccentric 1,9.

The radial distance (designated X in Figure 9) between the point ofcontact of the drive lip and drive shoulder and the axis of the wobbletube 21V is less Vthan the radial distance Y between this point and theaxis of precession ring. Consequently, the circumference of the .4circle described on the drive shoulder is correspondingly less than thecircumference of the drive lip. Assuming no peripheral slippage betweenthe drive shoulder and drive lip, the precession sleeve will turnrelative to the wobble tube with each gyration through a small arecorresponding to the differences in circumferences determined by radii Xand Y. The differences in circumference are, in fact, only a fewthousandths of an inch; consequently, the precession sleeve turns only aslight amount with each gyration of the wobble tube. It is feasible bythis means to provide a speed reduction between the rotor and theprecession sleeve of between /1 and 300/1; thus the rotor may turn at,for example, 3000 r.p.m. and cause the precession sleeve to turn between30 and 10 r.p.m. Other speed ratios may be utilized by predeterminingthe ratios of the radii X and Y.

The precession ring 38 is preferably made of harder material than theprecession sleeve, and the drive lip 41 may be relatively sharp,approximately 25 included angle, so as to wear` an annular groove 44 inthe drive shoulder 43. This groove will have the radius X. In so wearinga groove the drive connection is improved. Although the force of thedrive connection is limited, it is ample to effect rotation of thesleeve on Ithe wobble tube so that the jets of water issuing from thenozzle passages rotate accordingly.

The necessary contact pressure between the drive shoulder and drive lipis maintained by fthe upward force on the precession sleeve due to thewater pressure within the wobble tube exerted against the closed end ofthe precession sleeve. In order to protect the drive connection between:the drive shoulder and drive lip, a seal ring 45 may be providedbetween the sleeve 26 and 4the riser stem 7.l

Operation of the sprinkler head is as follows:

When the sprinkler is inactive, the riser is retracted as shown inFigure 2. As was pointed out hereinbefore, the rim 35 of the nozzle capares slightly; furthermore, the nozzle cap is preferably formed ofyieldable plastic material so that when the riser is retracted, the Irim35 wedges into the upper end of the slide bearing 5 to seal thesprinkler head. Thus, when the sprinkler is inactive, low pressure wateris prevented from seeping out of the sprinkler and dirt is excluded fromentering.

When the springler is activated, water pressure acting on the area ofthe riser stem 7 overcomes the force of the spring, causing the riser toextend -to the position shown in Figures l and 7. During the extensionof the riser, some water leaks through the side bearing 5, washing theriser stem. This also occurs during retraction of the riser. In order tominimize the possibility of sand particles wedging between the riserstern and the upper end'of the slide bearing, an annular V-groove 46 isformed at the upper end of the slide bearing which forms an annulardeflecting lip. When the riser is extended, the shoulder 8 seats againstthe lower end of the slide bearing and stops flow of water therethrough.

As soon as the nozzle head is clear of the cap 3, water flows throughthe screen 18 and is jetted by the nozzle orifices 17 against the rotor16, causing the wobble tube 21 to gyrate, and producing a slowprecession of the sleeve 26. Water discharges upwardly from the rotorbetween the wobble tube and riser stem, then through the perforations 23into the flow duct 22. The water then ilows radially through the portslits 27 and nozzle passages 34.

As represented in Figures 3, 4, 5, and 6, the spray pattern may be afull circle, or any predetermined part of a circle; by spoiling four ofthe twelve jets, sprinkling of the area adjacent the sprinkler head isassured. In fact, with the arrangement illustrated, the coverage persquare foot within the sprinkling circle is remarkably uniform.Furthermore, this uniformity is not sacrificed when the sprinkler isarranged to cover a portion of a circle. By reason of the fact that thenumber of sprinkling jets in operation are reduced in proportion to thereduction in arc sprinkled, the coverage per square foot remainsconstant, Whether a quarter circle is sprinkled or a full circle issprinkled.

Although a large number of iets are employed, they are purposely smallso that the capacity ofthe sprinkler head in gallons per minutedischarge is much less than is the common practice. The water lisdischarged, however, at high velocit-y so that the radius of coverage,and consequently, the spacing between sprinkler heads may be at amaximum. As a consequence, the rate of coverage per square foot of areais maintained suiciently low that run-olf is greatly reduced; that is,the percentage of the water which soaks into the soil is high. Bychanging the angle of the nozzle passages, and by altering the size ofthe rotor nozzle orifices, the capacity and radius may be predetermined.The characteristics of the sprinkler head set forth above are evidencedby the following table:

When the supply of water is shut off, the spring returns the riser 6 toits retracted position. Immediately, at the start of the returnmovement, a small amount of water ows upwardly through the slide bearing5 to wash the riser stem. The nozzle cap is drawn into the upper end of,and seals, the slide bearing on completion of the retraction movement.

Although a particular embodiment has been shown and described, theinvention is not limited thereto but includes the constructions,combinations, and karrangements embraced in the appended claims.

I Claim:

l. A sprinkler head, comprising: a tubular stem; a ow tube mountedtherein; a nozzle sleeve rotatably mounted on said flow tube and havingradiating discharge nozzle elements at its upper end beyond said tubularstem communicating with said flow tube; means for positioning said ilowtube and nozzle sleeve in an axis inclined relative to the axis of saidtubularstem and for gyrating said llow tube and nozzle sleeve in saidinclined axis about the axis of said tubular stem; and precession drivemeans incorporating mating elements carried by said sleeve and stem tocause precession of said sleeve about said inclined axis of said flowtube as said iiow tube gyrates.

2. A sprinkler head as set forth in claim l, wherein: said flow tubeincludes means operative as said nozzle sleeve rotates thereon to closesuccessive nozzle elements during their passage through a preselectedarc of travel thereby to cause the discharge from said nozzle elementsto be limited to a complementary arc.

3. A sprinkler head, comprising: a tubular stem; a flow tube mountedtherein; a nozzle sleeve rotatably mounted on said ow tube and havingradiating discharge nozzle elements at its upper end beyond said tubularstem communicating with said ow tube; means for positioning said dow.tube and nozzle sleeve in an axis inclined relative to the axis of saidtubular stem and for gyrating said flow tube andvnozzle sleeve `in saidinclined axis about the axis of said tubular stem; and axiallyconfronting annular shoulders on said sleeve within said stem mutuallyengageable as said flow tube and nozzle sleeve gyrate -to describecircles of contact of different circumference thereby to cause slowprecession of said nozzle sleeve relative to said tubular stem,

y4. A sprinkler head, comprising: a tubular stem; a flow tube mountedtherein; a nozzle sleeve rotatably mounted on said lowtube and havingradiating discharge nozzle elements at its upper eri'd beyond saidtubular stem communicating with said ow tube; means for positioning saidow'tube and nozzle sleeve in an ax-is inclined relative to` the axis ofsaid tubular stern and for gyrating said flow tube and nozzle sleeve insaid inclined axis about the axis of said tubular stem; axiallyconfronting annular shoulders on saidsleeve within said steiri mutuallyengageable as said flow tube and nozzle sleeve gyrate to describecircles of contact of differentl circumference thereby to` cause slowprecession of said nozzle sleeve relative to said tubular stem; andvalve means for limiting discharge from each of said rotating nozzleelements to a predetermined arc of travel.

`5. A sprinkler head, comprisingf a tubular stem; a ilow tube mountedtherein; yieldable mounting means intermediate the ends of said ow tuberestraining said flow tube against rotation about its longitudinal axis;a nozzle sleeve rotatably mounted on the upper end of said flow tube andhaving radiating discharge nozzle elements at its upper end beyond saidtubular stem communicating with said flow tube; a water actuated turbineand eccentric drive operated thereby, said eccentric drive engageablewith the lower end of said flow tube to incline said flow tube relativeto said tubular stem and gyrate said inclined flow tube and nozzlesleeve thereon about the axis of said tubular stem; and precession drivemeans incorporating mating elements carried by said sleeve and stem tocause precession of said nozzle sleeve relative to said tubular stem. v

6. A sprinkler head comprising: a casing structure adapted to beconnected to a water supply line; a tubular stem slideably mounted insaid casing structure and responsive to water pressure in said housingto move to an extended position; yieldable means for retracting saidstern on reduction in water pressure in said housing; a iiow tubemounted in said tubular stem; a nozzle sleeve rotatably mounted on saidilow tube and having radiating discharge nozzle elements at its upperend beyond said tubular stem communicating with said flow tube; sealmeans between said nozzle sleeve and stem; eccentric means engageablewith said flow tube to dispose said flow tube at an axis inclinedrelative to the axis of said tubular stem; drive means for saideccentric means lto cause said inclined axis to generate a conicalligure of revolution about the axis of said tubular stem, thereby tocause said flow tube and nozzle sleeve thereon to gyrate; and precessiondrive means incorporating mating elements carried by said sleeve andstem to cause precession of said nozzle sleeve relative to said tubularstem.

7. A sprinkler head as set forth in claim 6 wherein: yieldable meansrestraining said flow tube against rotation, whereby said nozzle sleevein its precession rotates thereon; said flow tube includes meansoperative as said nozzle sleeve rotates thereon to close successivenozzle elements during their passage through a preselected arc oftravel, thereby to cause the discharge from said nozzle elements to belimited to a complementary arc.

8. A sprinkler head comprising: a casing structure adapted tolbeconnected to a Water supply line; a tubular stem slideably mounted insaid casing structure and responsive to water pressure in said housingto move to an extended position; yieldable means for retracting saidstem on reduction in water pressure in said housing; a ilow tube mountedin said tubular stem; a nozzle sleeve rotatably mounted on said flowtube and having radiating discharge nozzle elements at its upper endbeyond said tubular stern communicating with said flow tube; seal meansbetween said nozzle sleeve and stem; drive means engageable with sa'idow tube to cause said iiow tube and said nozzle sleeve thereon togenerate a conical figure of revolution about the axis of said tubularstem; and axially confronting annular shoulders on said sleeve andwithin said stem mutually engageable as said ow tube and nozzle sleevegenerate said conical ligure of revolution to describe circles ofcontact of diierent circumference thereby to cause slow precession ofsaid sleeve about the axis of said flow tube.

9. A sprinkler head comprising: a casing structure adapted to beconnected to a Water supply line; a tubular stem slideably mounted insaid casing structure and responsive to water pressure in said housingto move to an extended position; yieldable means for retracting saidstem on reduction in water pressure in` said housing; a flow tubemounted in said tubular stem; a nozzle sleeve rotatably mounted on saidow tube and having radiating discharge nozzle elements at its upper endbeyond said tubular stem communicating with said flow tube; seal meansbetween said nozzle sleeve and stem; a water turbine unit mounted insaid casing structure and including an eccentric drive engageable withsaid ow tube to dispose said ow tube and nozzle sleeve at an axisinclined relative to said tubular sleeve whereby on rotation of saideccentric drive, said flow tube and nozzle sleeve gyrate to define aconical ligure of revolution about the axis of said tubular stem; andprecision drive means incorporating mating elements carried by saidsleeve and stem to cause slow precession of said nozzle sleeve relativeto said tubular stem.

l0. A sprinkler head comprising: a casing structure adapted to beconnected to a water supply line; a tubular stem slideably mounted insaid casing structure and responsive to water pressure in said housingto move to an extended position; yieldable means for retracting saidstem on reduction in water pressure in said housing; a turbine housingat the inner end of said stem within said casing structure and axiallymovable with said stem, said turbine housing having turbine nozzle portstherein forming means of communication between the interior of saidcasing structure and said stem; a turbine wheel mounted in said housingoperable by water issuing from said nozzle ports; a rotary spray headclosing the upper end of said stem; and speed reducing meansinterconnecting said tube and said rotary spray head. v

11. A sprinkler head as set forth in claim 10 wherein: said rotary sprayhead includes a yieldable seal means engageable with said casingstructure as said stern is retracted to seal said casing structureagainst outow of low pressure water and entrance of deleterious matter.

12. In a sprinkler head, a rotary spray unit, comprising: a llow tube; asleeve capping said ow tube and rotatably mounted thereon, said sleevehaving a plurality of radially directed water discharge ports; andspoiler elements protruding into the water streams issuing from selectedports.

13. A sprinkler head comprising: a ow tube; a sleeve capping said owtube and rotatably mounted thereon, said sleeve having a plurality ofradially directed water discharge ports; spoiler elements protrudinginto the water streams issuing from selected ports; means for supportingsaid flow tube for non-rotational gyrating movement; means for gyratingsaid flow tube; and means for causing procession of said sleeve aboutsaid ow tube as said flow tube gyrates.

14. In a sprinkler head, a rotary spray unit, comprising: a flow tube; asleeve capping said flow tube and rotatably mounted thereon, said sleevehaving a plurality of radially directed water discharge ports; spoilerelements protruding into the water streams issuing from selected ports;said ow tube having an arcuate projection positioned to close successivedischarge ports as said sleeve rotates, -whereby water tlow is shut offwithin an arc deiined by said projection.

15. A sprinkler, comprising: a tubular stem having a longitudinal axisand an internal precession shoulder; a

rotary nozzle means having a longitudinal axis in acute angular relationto said tubular stem axis, said nozzle means being disposed within saidstern and including an external precession shouldere in angular andeccentric relation to and engageable with said internal precessionshoulder, said nozzle means projecting beyond said stem and having anozzle port; means for gyrating the longitudinal axis of said nozzlemeans about the axis of said tubular stem'to cause precession of saidexternal precession shoulder relative to said internal precessionshoulder and corresponding rotation of said nozzle means relative tosaid tubular sleeve; and means for supplying water to said nozzle port.

16. A sprinkler, comprising: a tubular stem having a longitudinal axisand an internal precession shoulder; a rotary nozzle having alongitudinal axis in acute angular ,relation to said tubular stem axis,said nozzle means being disposed within said stem and including anexternal precession shoulder in angular and eccentric relation to andengageable with said 'internal precession shoulder, said nozzle meansprojecting beyond said stem and having a nozzle port; a tubular journalfor said nozzle means having a longitudinal axis coincident therewith;means for gyrating the common axis of said journal and said nozzle meansabout the axis of said tubular stem to cause precession of said externalshoulder relative to the internal shoulder of said tubular stem; andmeans for supplying water through said tubular journal to said nozzleport.

17. A sprinkler, comprising: a tubular stem having a longitudinal axisand an internal precession shoulder; a rotary nozzle having alongitudinal axis in acute angular relation to said tubular stern axis,said nozzle means being disposed within said stem and including anexternal precession shoulder in angular and eccentric relation to andengageable with said internal precession shoulder, said nozzle meansprojecting beyond said stem and having a nozzle port; a tubular journalfor said nozzle means having a longitudinal axis coincident therewith; awater actuated turbine and an eccentric rotated thereby, said eccentricengageable with said journal to cause gyration of the common axis ofsaid journal and nozzle means about the axis of said stern thereby tocause relative precession of said precession shoulders; and means forsupplying water to said nozzle port through said journal.

18. A sprinkler, comprising: a tubular stem having a longitudinal axisand an internal precession shoulder; a rotary nozzle means having alongitudinal axis in acute angular -relation to said tubular stem axis,saidv nozzle means being disposed within said stem and including anexternal precession shoulder, said nozzle means projecting beyond saidstem and having a plurality of radiating nozzle ports; a tubular journalfor said nozzle means and having a longitudinal axis coincidenttherewith, said journal having an arcuate valve extremity closing aportion of said nozzle ports; means for gyrating the common axis of saidjournal and nozzle means about the axis of said tubular stem to causeprecession of said external shoulder relative to said internal shoulderwhereby said nozzle means is caused to rotate; means for restrainingsaid journal against rotation whereby, upon rotation of said nozzlemeans, said nozzle ports are covered and uncovered successively by thearcuate valve extremity of said journal; and means for supplying waterthrough said journal and uncovered nozzle ports.

References Cited in the tile of this patent UNITED STATES PATENTS1,753,841 Thompson Apr. 8, 1930 1,821,579 Rader Sept. l, 1931 2,639,191Hruby May 19, 1953 2,739,839 Greener Mar. 27, 1956

